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    <title>Document</title>

    <script>

        var  money = prompt("请班长输入所带的钱数")

        if(money >=  2000){

            alert("班长请大家吃西餐")

        }else  if(money >=  1500){

            alert("班长请大家吃快餐")

        }else  if(money >=  1000){

            alert("班长请大家喝饮料")

        }else  if(money >=  500){

            alert("班长请大家吃棒棒糖")

        }else  {

            alert("班长下次把钱带够")

        }

    </script> 

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